body {
    background-image: url("../img/1.jpg");
}
span {
    color: red;
    width: 350px;
    height: 15px;
    margin: auto;

}
.reminder{
    width: 350px;
    height: 30px;
    font-size: 17px;
    line-height: 30px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 110px;
}
.reminder p{
    text-align: center;
}

.interface {
    width: 350px;
    height: 450px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left: -200px;
    margin-top: -250px;
    background-color: white;
    border-radius:  20px;
    opacity: 0.7;
}

.login_sign {
    text-align: center;
}

form {
    width: 300px;
    height: auto;
    margin-top: 30px;
    margin-left: auto;
    margin-right: auto;
}

input {
    width: 18.125rem;
    height: 40px;
    margin-bottom: 20px;
    border-radius: 20px;
    border-style: solid;
    border-color: #808080;
    font-family: "宋体";
    font-size: 18px;
    text-align: center;
    outline: none;
}

.login {
    border: none;
    width: 200px;
    background-color: #87CEFA;
}

.login:hover {
    border: none;

    background-color: #6495ED;
}

.register {
    position: inherit;
    bottom: 2px;
    left: 30px;
}

